:root {
  --red: #e3313d;
  --red-dark: #b91f30;
  --blue: #135fc7;
  --blue-dark: #083b88;
  --sky: #e9f4ff;
  --ink: #142033;
  --muted: #5c6a7e;
  --line: rgba(19, 95, 199, 0.15);
  --white: #ffffff;
  --glass: rgba(255, 255, 255, 0.74);
  --shadow: 0 24px 70px rgba(10, 43, 95, 0.16);
  --radius: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--white);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(19, 95, 199, 0.045) 1px, transparent 1px) 0 0 / 72px 72px,
    linear-gradient(rgba(19, 95, 199, 0.04) 1px, transparent 1px) 0 0 / 72px 72px,
    #f8fbff;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(255, 255, 255, 0.72);
  background: rgba(248, 251, 255, 0.82);
  backdrop-filter: blur(18px);
}

.nav-shell {
  width: min(1180px, calc(100% - 40px));
  height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: #fff;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--red), var(--blue));
  box-shadow: 0 10px 24px rgba(227, 49, 61, 0.25);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  padding: 10px 12px;
  color: #38475c;
  border-radius: 8px;
  font-size: 14px;
  transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--blue-dark);
  background: rgba(19, 95, 199, 0.08);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(19, 95, 199, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.8);
}

.nav-toggle span:not(.sr-only) {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--blue-dark);
}

.section-band,
.section {
  position: relative;
  overflow: hidden;
}

.hero {
  min-height: min(760px, calc(100vh - 72px));
  padding: 42px 0 48px;
  display: grid;
  align-items: start;
}

.tile-grid {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 78% 20%, rgba(19, 95, 199, 0.14), transparent 28%),
    radial-gradient(circle at 18% 78%, rgba(227, 49, 61, 0.12), transparent 24%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(232, 244, 255, 0.78));
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
  gap: 46px;
  align-items: center;
}

.hero-copy {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(40px, 5.4vw, 72px);
  line-height: 1.03;
  letter-spacing: 0;
  overflow-wrap: normal;
  word-break: keep-all;
  white-space: nowrap;
}

.hero-subtitle {
  margin: 20px 0 0;
  color: var(--red-dark);
  font-size: clamp(20px, 2.8vw, 34px);
  font-weight: 800;
}

.summary {
  max-width: 660px;
  margin: 22px 0 0;
  color: #3c4b60;
  font-size: 17px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 800;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--red), var(--blue));
  box-shadow: 0 18px 35px rgba(19, 95, 199, 0.24);
}

.btn-secondary {
  color: var(--blue-dark);
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(19, 95, 199, 0.16);
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.trust-row span,
.mini-badges span {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 12px;
  color: var(--blue-dark);
  border: 1px solid rgba(19, 95, 199, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.68);
  font-weight: 700;
  font-size: 13px;
}

.product-stage {
  min-height: 520px;
  display: grid;
  place-items: center;
}

.glass-panel {
  border: 1px solid rgba(255, 255, 255, 0.72);
  background: var(--glass);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.product-card {
  position: relative;
  width: min(100%, 430px);
  min-height: 500px;
  display: grid;
  place-items: center;
  border-radius: 8px;
}

.product-card::before {
  content: "";
  position: absolute;
  inset: 34px;
  border: 1px solid rgba(19, 95, 199, 0.1);
  border-radius: 8px;
  background:
    linear-gradient(90deg, rgba(19, 95, 199, 0.06) 1px, transparent 1px) 0 0 / 38px 38px,
    linear-gradient(rgba(19, 95, 199, 0.05) 1px, transparent 1px) 0 0 / 38px 38px;
}

.product-tube {
  position: relative;
  width: 156px;
  height: 410px;
  transform: rotate(-13deg);
  filter: drop-shadow(0 28px 28px rgba(9, 43, 86, 0.2));
  z-index: 2;
}

.tube-cap {
  width: 80px;
  height: 36px;
  margin: 0 auto -2px;
  border-radius: 8px 8px 4px 4px;
  background: linear-gradient(180deg, #f3f7fb, #c7d5e7);
  border: 1px solid rgba(20, 32, 51, 0.08);
}

.tube-neck {
  width: 58px;
  height: 34px;
  margin: 0 auto;
  background: linear-gradient(90deg, #dae6f4, #ffffff, #c2d4e8);
}

.tube-body {
  position: relative;
  width: 156px;
  height: 285px;
  overflow: hidden;
  border-radius: 8px 8px 26px 26px;
  background: linear-gradient(90deg, #eef6ff 0%, #fff 42%, #e7f2ff 100%);
  border: 1px solid rgba(20, 32, 51, 0.1);
}

.tube-body::after {
  content: "";
  position: absolute;
  top: 0;
  right: 14px;
  width: 28px;
  height: 100%;
  background: rgba(255, 255, 255, 0.42);
}

.tube-band {
  position: absolute;
  left: -8px;
  right: -8px;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.tube-blue {
  top: 0;
  height: 56px;
  background: linear-gradient(135deg, var(--blue), #53a6ff);
}

.tube-red {
  bottom: 0;
  height: 62px;
  background: linear-gradient(135deg, var(--red-dark), var(--red));
}

.tube-label {
  position: absolute;
  inset: 72px 18px 76px;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 8px;
  text-align: center;
}

.tube-label strong {
  color: var(--red);
  font-size: 34px;
  line-height: 1;
}

.tube-label span {
  color: var(--blue-dark);
  font-weight: 800;
  font-size: 14px;
}

.tube-label .label-series {
  width: 72px;
  color: #fff;
  border-radius: 8px;
  background: var(--blue);
  line-height: 28px;
}

.tube-nozzle {
  width: 32px;
  height: 62px;
  margin: -1px auto 0;
  clip-path: polygon(22% 0, 78% 0, 62% 100%, 38% 100%);
  background: linear-gradient(90deg, #d9e7f7, #ffffff, #bdd2e9);
}

.product-shadow {
  position: absolute;
  bottom: 82px;
  width: 250px;
  height: 34px;
  border-radius: 50%;
  background: rgba(9, 43, 86, 0.13);
  filter: blur(8px);
}

.mini-badges {
  position: absolute;
  right: 28px;
  bottom: 26px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
  z-index: 3;
}

.section {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 86px 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading.compact {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 30px;
  border-left: 4px solid var(--red);
  background: rgba(255, 255, 255, 0.68);
  box-shadow: 0 18px 50px rgba(10, 43, 95, 0.08);
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.15;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 19px;
  line-height: 1.35;
}

.section-heading p:not(.eyebrow),
.feature-card p,
.scene-list p,
.step-card p,
.faq-item p,
.site-footer p {
  color: var(--muted);
  line-height: 1.75;
}

.section-heading p:not(.eyebrow) {
  margin: 16px 0 0;
  font-size: 16px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  min-height: 238px;
  padding: 26px;
  border-radius: 8px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 28px 70px rgba(10, 43, 95, 0.18);
}

.feature-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  margin-bottom: 24px;
  color: #fff;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--red), var(--blue));
  font-weight: 900;
}

.section-blue {
  width: 100%;
  max-width: none;
  padding-left: max(20px, calc((100% - 1180px) / 2));
  padding-right: max(20px, calc((100% - 1180px) / 2));
  background:
    linear-gradient(135deg, rgba(19, 95, 199, 0.1), rgba(227, 49, 61, 0.06)),
    rgba(255, 255, 255, 0.62);
}

.scene-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: 30px;
  align-items: stretch;
}

.scene-visual {
  min-height: 430px;
  padding: 26px;
  border-radius: 8px;
  background: linear-gradient(135deg, #ffffff, #e9f4ff);
  box-shadow: var(--shadow);
}

.countertop {
  position: relative;
  height: 100%;
  min-height: 378px;
  overflow: hidden;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(226, 241, 255, 0.9)),
    linear-gradient(90deg, rgba(19, 95, 199, 0.08) 1px, transparent 1px) 0 0 / 96px 96px,
    linear-gradient(rgba(19, 95, 199, 0.08) 1px, transparent 1px) 0 0 / 96px 96px;
}

.countertop::before {
  content: "";
  position: absolute;
  right: 36px;
  top: 40px;
  width: 156px;
  height: 96px;
  border-radius: 50%;
  border: 18px solid rgba(19, 95, 199, 0.12);
  background: rgba(255, 255, 255, 0.66);
}

.tile-line {
  position: absolute;
  background: rgba(19, 95, 199, 0.12);
}

.tile-line.horizontal {
  left: 0;
  right: 0;
  height: 2px;
}

.tile-line.vertical {
  top: 0;
  bottom: 0;
  width: 2px;
}

.tile-line.horizontal.one {
  top: 34%;
}

.tile-line.horizontal.two {
  top: 68%;
}

.tile-line.vertical.one {
  left: 24%;
}

.tile-line.vertical.two {
  left: 52%;
}

.tile-line.vertical.three {
  left: 78%;
}

.seal-line {
  position: absolute;
  left: 24%;
  top: 34%;
  width: 28%;
  height: 5px;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--red), var(--blue));
  box-shadow: 0 0 0 8px rgba(255, 255, 255, 0.72);
}

.scene-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.scene-list article {
  padding: 24px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(19, 95, 199, 0.1);
}

.scene-list article:last-child {
  grid-column: 1 / -1;
}

.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.step-card {
  position: relative;
  min-height: 250px;
  padding: 24px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 16px 40px rgba(10, 43, 95, 0.08);
}

.step-card span {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 24px;
  color: #fff;
  border-radius: 8px;
  background: var(--blue);
  font-weight: 900;
}

.step-card:nth-child(even) span {
  background: var(--red);
}

.specs-section {
  padding-top: 54px;
}

.specs-card {
  border-radius: 8px;
  overflow: hidden;
}

.specs-list {
  margin: 0;
}

.specs-list div {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 18px;
  padding: 22px 26px;
  border-bottom: 1px solid rgba(19, 95, 199, 0.12);
}

.specs-list div:last-child {
  border-bottom: 0;
}

.specs-list dt {
  color: var(--blue-dark);
  font-weight: 900;
}

.specs-list dd {
  margin: 0;
  color: #33445a;
  line-height: 1.65;
}

.faq-section {
  padding-top: 54px;
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  padding: 24px 26px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(19, 95, 199, 0.12);
  box-shadow: 0 14px 36px rgba(10, 43, 95, 0.07);
}

.faq-item h3 {
  color: var(--blue-dark);
}

.site-footer {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 34px 0 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid rgba(19, 95, 199, 0.14);
}

.site-footer p {
  margin: 8px 0 0;
}

.site-footer a {
  color: var(--blue-dark);
  font-weight: 800;
}

@media (max-width: 920px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    left: 20px;
    right: 20px;
    top: 66px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    border: 1px solid rgba(19, 95, 199, 0.13);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow);
  }

  .nav-links.is-open {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding-top: 30px;
  }

  .hero-inner,
  .scene-layout {
    grid-template-columns: 1fr;
  }

  .product-stage {
    min-height: 460px;
  }

  .feature-grid,
  .scene-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .nav-shell,
  .hero-inner,
  .section,
  .site-footer {
    width: min(100% - 28px, 1180px);
  }

  .nav-shell {
    height: 64px;
  }

  .brand span:last-child {
    font-size: 14px;
  }

  .hero {
    padding: 24px 0 42px;
  }

  h1 {
    font-size: clamp(30px, 9.4vw, 42px);
  }

  .summary {
    font-size: 15px;
  }

  .hero-actions,
  .btn {
    width: 100%;
  }

  .product-card {
    min-height: 420px;
  }

  .product-tube {
    width: 132px;
    height: 350px;
  }

  .tube-body {
    width: 132px;
    height: 238px;
  }

  .tube-label strong {
    font-size: 28px;
  }

  .tube-nozzle {
    height: 52px;
  }

  .feature-grid,
  .scene-list,
  .steps {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 60px 0;
  }

  .section-heading.compact {
    padding: 22px 20px;
  }

  .scene-visual {
    min-height: 300px;
  }

  .countertop {
    min-height: 248px;
  }

  .step-card {
    min-height: auto;
  }

  .specs-list div {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 20px;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}